C语言判断输入数正负

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
int shu1,shu2;
printf("请输入需要判断的数：");
scanf("%d",&shu1);
if(shu1>0)
{
shu2=1;
}
else if(shu1==0)
{
shu2=0;
}
else if(shu1<0)
{
shu2=-1;
}
printf("输出\n-1，则小于0；\n0，则等于0；\n1则大于0；\n输出为：%d",shu2);
return 0;
}